Rainbow Electronics MAX1760 - Manual

General Description
The MAX1760 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It maintains exceptionally low qui-
escent supply current (100µA) despite its high 1MHz
operating frequency. Small external components and a
tiny 10-pin µMAX package make this device an excel-
lent choice for small hand-held applications requiring
the longest possible battery life.
The MAX1760 uses a synchronous-rectified pulse-
width-modulation (PWM) boost topology to generate
2.5V to 5.5V outputs from a wide range of input
sources, such as 1 to 3 alkaline or NiCd/NiMH cells or a
single lithium-ion (Li+) cell. Maxim's proprietary Idle-
Mode™ circuitry significantly improves efficiency at
light load currents while smoothly transitioning to fixed-
frequency PWM operation at higher load currents to
maintain excellent full-load efficiency.
Low-noise, forced PWM mode is available for applica-
tions requiring constant-frequency operation at all load
currents. The MAX1760 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment. Analog soft-start and
adjustable current limit permit optimization of efficiency,
external component size, and output voltage ripple.
Applications
Digital Cordless Phones PCS Phones
Wireless Handsets Hand-Held Instruments
Palmtop Computers Personal Communicators
Two-Way Pagers
Features
♦ Up to 94% Efficiency
♦ 0.7V to 5.5V Input Range
♦ Up to 800mA Output
♦ Fixed 3.3V Output (or adj from 2.5V to 5.5V)
♦ PWM Synchronous Rectified Topology
♦ Low-Noise, Constant Frequency Operation (1MHz)
♦ 0.1µA Logic-Controlled Shutdown
♦ Synchronizable Switching Frequency
♦ Adjustable Current Limit
♦ Adjustable Soft-Start
♦ 10-Pin µMAX Package
MAX1760
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
________________________________________________________________ Maxim Integrated Products 1
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10
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POUT
LX
PGND FB
GND
REF
ISET
MAX1760
µMAX
TOP VIEW
CLK/SEL OUT
ON
PGND FB GND
POUT
LX
ISET
OUT
REF
CLK/SEL
INPUT = 0.7V
TO V OUT
V OUT = 3.3V,
800mA
ON
MAX1760
Typical Operating Circuit
19-1660; Rev 1; 1/01
PART
MAX1760EUB -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
EVALUATION KIT
AVAILABLE
Idle Mode is a trademark of Maxim Integrated Products.
Pin Configuration
Ordering Information
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.